<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" type="text/css" href="../css/all.css"/>
</head>
<body>
    <ul class="nav-main">
        <li class="nav-menu nav-menu-focus" id="menu1">
            <span class="nav-menu-span">菜单1</span>
        </li>
        <li class="nav-menu" id="menu2">
            <span class="nav-menu-span">菜单2</span>
        </li>
        <li class="nav-menu" id="menu3">
            <span class="nav-menu-span">菜单3</span>
        </li>
    </ul>
</body>
</html>